Jack structure



.im 16, 1940. D MLSQN 2,187,279

JACK STRUCTURE V Filed July 18, 1938 l @rag-50:

" 2 -nosey l Aftur'ther object is ating means `for An object of@ my` present 4invention tol pro-4 l vldea jack structure partiularly'adapted" ion i -use in connection with lifts'for automobiles and for the purpose of hoist duringl lubricating :opera the automobile is on a litt so that/the springs can be properly lubricated." i

A furthero'bject is the operating means `for scopically `mounted on f the jack at ya position intermediate lthrough slots in the sidesfof the jackv sothat the'operating means can be locatedlexterior of .j the jack and intermediate the ends thereof;l so

Still a furtherjobject is to provideoperating f means lforI the jack`fon both raising and lowering u .the jack, such operating means being conveni-J engaged."1 .fk With these and other objects in view my inently positioned for a jack ofthe post-like type disclosed without'any vlevers or the likexextendf the jack into the way of the ing laterally fro i operator as he performslubricating operations t on an automobile with which ventlon consists in vtbe construction; arrangemy device,` whereby the objects contemplated structure is 'susceptible vol! are attained. as

f Although.: my, jack` i a variety of embodi ments, it is unnecessary to fully describe and illustrate more than one in order togivea full accompanying drawing.

understanding of the invention both from its- Accorda `preferred andl desirstructural and functional standpoints.

ingly, I have illustrated able embodiment of the' invention in? the acy companving drawing. in which: .i

Figure 1 is a diagrammatic side elevation of `my ljaar: structure showing'itbe'ing used in cori-` elevating the chassis of ani provide a .lack structure which is particularly adapted ,for relieving the load on the springs of an automobile whilel its lengthto accomplish'this pur-f` l to `provide -a jack strucv ,ture which is of'compact-post-like construction having lifting means within the jack and .oper-v the lifting means extending 15` claims. fici, 'cti- 93;

automobile is in. elevated posito provide'- agjackof this f character `which can be interposed between the i iloor'surface and the chassis of thejautomobile and convenientlyoperated Bylanloperator while lin a standing positionv under the automobile,`

f the jack being telel-H screw AI Ily having a handle 12; biofextends rotatably through a? lug I3k yon the lower end voi lthe section L therein. On the other side' of4 the slot vI4 aiugj nection wlthlanfautomoblegtbe automobile y on aglift which is shown in elevated position.

Figure 2 is'anenlargedverticalv sectional View i l f v,as takenon the'lin'e 2-2 of4 o jnthe supporting- Amember section, L and an upper section L.-

tion L' is telescopically. mounted on L'andymay .be locked Sec-j the'. section l adjacentl a slot I4'-V Figure 1, tneiowerend. Orchis figure being a ,continuation of the upper end of Figure-2 I Figure 4 isanenIarged side. elevationpoithe central portion=of the jack shown 'in Figure 1; f `and Il" i i `Figure 5is a sectional view Ion the1ine\ 5`5 j 15 the reference` character B to' indica-te' ,a base and S afsupportngjmember of fscopically'mounted l -L`-Sy`is ltubularlifting member comprising'a lower l relative theretov byfa set .The set screw l f Al5-isithreaded to receive the set Screw |,where the jack `has been j y jack to be setvat an' angle relative 4inent and combination of the various parts o1' wherebya lifting piston 20 yan `elevation of the lifting when oil-is pumped into the cylinder VS below 4a sleeve 2| 'which in turn is' vting 22 and a second sleeve 23 to a, heat 24.

"or, necessary while hereinaitenmore fully set forth, pointed out in my claims and illustrated in the lifting vmember L Ihe supporting memberS isfpr'oviclcd with a headpll on' Aits lower end termina'tlngin a bau |11. The :bail

IT 'is seated in a socket I8 of thefbase member-Biwhereby the base mem-r the support pport permit the tothe floor by when the set screw' is tightened', tbeflugslv A maybe-drawn' toward each ing the section L 30` box or the u surfacel (see Figure l)I if found desirable using the jack.

The support S maybeformed a cylinder therein may effect members L and L' the piston 20. {pistonz is connected with The head 24 is screw threadedly mounted in .the

as shownln Figure 2 whereby ll'any movement be impartedto the Atgthe lower end lifting member.

jpaclrlngv glandf25 and a packingnut 26' are connected by a,iit-

of the lifting piston 20 will provided to prevent undesirable leakage/of the oil from the jack structure to the exterior thereof as the space between the cylinder S and the lifting member L as indicated at 21 is a reservoir space for oil. A further reservoir space is provided at 28 between the cylinders/gend 23.

For the purpose of pumping oil from the reservoir space 28 to the cylinder S below the lifting piston 2|) I provide a pump structure including a pump cylinder 29 and a pump plunger 30 reciprocable therein. An intake valve 3| and an outlet valve 32 are normally seated against seats 33 and 34 respectively of the sleeve 2| and the fitting 22. These valves are spring urged to their closed positions and are fully disclosed in my co-pending application, Serial No. 132,565, filed March 23, 1931.

On the up stroke of the plunger 30, the valves 3| and 32 will close whereas they are shown inopen position Ain Figure 2. Afterthe valve 3| closes, further upward movement of the plunge 30 will result in a vacuum being formed between the valves 3| and 32 which will open'the valve 3| for letting oil into the cylinder 29 through the seat 33 from the reservoir space 28. The lower end of the sleeve 23 is perforated as at 35a to lpermit the oil to flow from the oil reservoir 28; On the down stroke of the plunger 30, the valve 3| will be closed and the valve 32 opened so that the oil can be displaced from the space between the valves 3| and 32 to the space in the cylinder S below the lifting piston 20. It is therefore obvious that reciprocations of the plunger 30 will cause step by step raising of the piston and consequently the lifting members L and L'.

The lifting member L is merely an extension of the lifting member L so asto give the jack a greater range of elevation. The lifting member L has on its top end a head 36 adapted to engage the chassis of an automobile such as the cross member 31 thereof as shown in Figure 1. Thereby the chassis can be raised for releasing the tension on the springs 38 so that they can be properly lubricated while the lift structure 39 is supporting the automobile A in elevated position.

It is undesirable to have an operating member for the plunger 30 at the upper end of the jack structure. On the other hand it is desirable to have such an operating member located intermediate the ends of the jack. I accordingly provide an operating sleeve 40 telescopically mounted on the lifting member L andbperatively connected with the pump plunger 30 by connector elements 4| and 42.

The connector element 4| is a disk slidable within the lifting member L and connected with the plunger 30 as by lock nuts 43. The elements 42 are screws extending through the sleeve 40 and through slots 44 into the connector element 4|. The slots 44 extend longitudinally of the lifting member L whereby the sleeve 40 can be reciprocated therealong and the screws 42 extending through the slots 44 will transmit such reciprocations to the plunger 30.

As illustrated in Figure 2, the' plunger 30- has an extension 45 which is adaptable to engage the outlet valve 32 and disengage it from its seat 34 after the lower end of the plunger 30 has dis engaged the intake valve 3| from its seat 33. Each slot 44 at its lower end has a circumferentiaily extending portion 46 terminating in a downwardly extending portion 41. When the screws 42 are at the lower ends of the portions 41, the plunger 30 assumes the position shown in Figure 2 for permitting the oil to flow from under of accidental the lifting piston 2D back to the reservoir space 28. Thereby the jack can be lowered and its speed of descent controlled as desired. Normally, however, without rotating the operating sleeve 40, it can be reciprocated with the screws 42 remaining in the slots 44 for elevating operation of the jack.

My arrangement permits the use of a postlike jack structure and operation thereof from a convenient working position of the operator when lubricating an automobile on a hoist. All projecting parts are eliminated and it is only by special manipulation of the sleeve 40 that the jack can be lowered. Accordingly the chance lowering thereof is minimized.

Some changes may be made in the construction and arrangement of the parts of my jack structure without departing from the real spirit and purpose of my invention, and it is therefore my intention to cover by my claims, such modified forms of structure or use of mechanical equivalents, as may be reasonably included within their scope.

I claim as my invention:

l. In a jack structure of the character described, a vertical support, a lifting member slidable longitudinally relative thereto, lifting means within said lifting member and operatively connected therewith, said lifting means comprising a lifting piston, a pump within .said lifting member for pumping oil to said lifting piston and an operating member for said pump comprising a piston rod, a handle slidable along the side of said lifting member, a slot in the wall of the lifting member, means extending through said slot for operatively connecting said handle and piston rod together, said slot extending longitudinally of said lifting member and having a circurnferentially extending portion at one end thereof terminating in another longitudinally extending portion, said means of operative connection between said sleeve and piston rod being normally limited in its movement by saidslot but capable of movement in said last mentioned longitudinally extending portion thereof after rotation in said circumferentially extending portion thereof and release means for said lifting mechanism of said jack structure operable by movement of said operative connection in said last mentioned longitudinally extending portion of said slot.

2. In a jack structure of the character described, a vertical support, a 'lifting member slidable longitudinally relative thereto, lifting means within said lifting member comprising a lifting piston, an operative connection between said lifting piston and said lifting member, a pump Within said lifting member for pumping oil through said lifting piston and an operating member for said pump comprising a piston rod, a sleeve telescopically slidable on said lifting member and an operative connection through the wall of said lifting member from said sleeve to said piston rod, a slot in said wall, said operative connection extending through said slot, said slot extending longitudinally of said lifting member and having a circumferentially extending portion at one end thereof terminating inI another longitudinally extending portion, and release means for said lifting mechanism of said jack structure operable by movement of said operative connection in said last mentioned longitudinally extending portion of said slot.

3. In a jack structure, a vertical support, a tubular` element slidable thereon and having means at its upper end for engaging an object to be elevated by said jack, a lifting piston connected with said tubular element for raising it relative to said vertical support, means for pumping oil to the lifting piston including a pump hav ing a vertically reciprocable member Within said tubular element, said tubular element having a slot through the wall thereof and means exterior of said tubular element and extending through said slot for connection with said vertically reciprocable member for operating the pump when said means is reciprocated longitudinally of said tubular element, said means comprising a'sleeve surrounding the tubular element.

4. In a jack structure, a vertical cylinder, object raising means slidable thereon and including a pair of tubular elements telescopically mounted relative to each other, a lifting piston within said cylinder and having a piston rod projecting above the upper end thereof, an operative connection between said pistonrod and said slidable object raising means to raise the means when oil is 5. In a jack structure, a vertical support, ob` ject raising means slidable thereon and including a pair of tubular elements telescopically mounted relative to each other, a lifting piston to raise said object raising means when oil is pumped to the lifting piston and a pump for so pumping oil, said pump having an operating rod, release means for said lifting piston, said operating rod being associated therewith to operate the release means when it is desired to permit the jack to lower and an operator for said operating rod having an operative connection with said operating rod through the wall of said object raising means.

6. In a jack structure of the character described, a vertical support, a lifting sleeve slidable longitudinally relative thereto, lifting and lowering means for said lifting sleeve enclosed within said lifting sleeve and carried thereby, an operating sleeve surrounding said lifting sleeve, a slot in said lifting sleeve, connecting means between said lifting and lowering means and said operating sleeve for operating said lifting and lowering means, said slot having a portion normally receiving said connecting means during lifting operations and another part receiving said connecting means during lowering operations of the jack structure.

7. In a jack structure, a verticall support, a lifting sleeve slidable longitudinally relative thereto, lifting and lowering means for elevating and lowering said lifting sleeve relative to said vertical support, an operating member Vfor said lifting and lowering means, said lifting ing means during lowering operations of the jack structure.

8. In a' jack of the class described, a vertical supporting member, a tubular lifting member slidable telescopically thereon, lifting mechanism within said lifting member and operatively connected therewith, an actuating handle member for said lifting mechanism operatively connected therewith and telescopically slidable upon the exterior of said lifting member below the upper end thereof and extension means for said upper end and having object engaging means onits upper end for engaging an object to be elevated by said jack structure.

9. In a jack of the class described, a vertical `supporting member, a lifting member slidable telescopically thereon, lifting mechanism within said lifting member and operatively connected therewith and an actuating handle member for said. lifting mechanism operatively connected therewith and slidable along the exterior of said lifting member belovir the upper end thereof.

l0. In a jack structure, a vertical cylinder, a lifting sleeve slidable longitudinally relative thereto, lifting means comprising a lifting piston operatively connected, with said lifting sleeve and operable to raise it relative to said vertical cylinder, a pump to raise said lifting sleeve, an operating and release rod for said pump extending into said lifting sleeve, an operating sleeve on the exterior of said lifting sleeve for reciprocating said release rod and extendingthrough a slot in saidlifting sleeve, lowering mechanism for said jack structure, said slot having a sub- `stantially straight portion in which said operatlng sleeve operates normally for lifting operations and another portion in which said operating sleeve operates after it is rotated relative to said lifting sleeve, said operating and release rod then acting in its release capacity for operating said lowering mechanism.

11. In a jack structure, a vertical support, `a lifting sleeve slidable longitudinally relative thereto, lifting means comprising a lifting piston operatively connected with said lifting sleeve and operable to raise it relative to said vertical cylinder, a pump to raise said lifting sleeve, an operating' and release rod for said pump'extend' ing into said lifting sleeve, release means for said lifting means, an operating member on the exterior of said lifting sleeve for reciprocating and operating said operating and release rod, a slot in said lifting sleeve having a substantially straight portion through which said operating member extends normally for lifting operations and another portion through which said memberextends when operating said operating and release rod to cause operation of said lowering mechanism.

12. A jack structure comprising telescopically extensible members having means for engaging a iioor or the like on one end thereof and means on the other end thereof for engaging an object to be elevated thereby, lifting mechanism within said jack structure and an operating sleeve for said lifting mechanism which is telescopically movable along the exterior of said jack structure and connected through a slot in the wall thereof with said lifting mechanism.

13. In a jack structure, a vertical support, a piston slidable therein, a sleeve slidable relative to said vertical support, connected` to said piston and adapted for engagement with an object to be raised by said jack"structure, a chamber formed by the space in said support below said piston, a reservoir formed by the spaces in said support above said piston, fluid in saidreservoir and in said chamber, av pump for forcing said fluid from said reservoir to said chamberl through said piston, a vertically reciprocable operating member within saidfsleeve for operating said pump, a vertically reciproca-ble handle member encircling said sleevepand a slot in 'said sleeve,

said operating member being connected to said handle member through said slot. g v t 14. In a jack structure, a verticalsupDOl't. a

piston slidable therein, a`,sleeve slidable` relativev .to said vertical support, connected-to said piston and adapted for engagement with an object to be raised by said jack structure, a chamber formed by the' space in said support below lsai'dz piston. a reservoir formedby the spaces .in saidv support above said piston, fluid in` said reservoir and in said chamber, a pump' for forcing said fluid from said reservoir to said chamber through said piston, a, vertically reciprocable'operating member within said sleeve for. operating said' pump, a vertically reciprocable `handle member encircling said sleeve. a slot in said sleeve; saidv operating member being connected to said hanjdle member through said slot, said slot'having., a circumferentially extending portion atone end l thereof terminating in another longitudinally ex` tending portion, and release meansfor permitting return oi' said fluid from said chamber. to said ala'mvag,

reservoir through said piston, said releasemeans `being operable by movement of.' said operating memberinsaid .last mentioned i, 101igitudinallyv extending portion of'said slot. y

15. In a jack structure, ,a vertical Asupporta piston l'slidable`therein, a sleeve slidablev relative 1 to said vertical `supportand connectedto said piston, a chamber vformed by theI `,space "inv said support below said piston',` azreservoir formed by. -10 '1 the spaces in said support above,said piston, a

fluid in'saidreservoir and in said chamber, a

nected tol said handle member through-said slot,

said slot having'.- a.-.circun'iferentially .extending f portion at one end" thereof terminating manly"l .4,

pump for 'forcing said uid` fromvsaidreservoir to 'said chamber,` release means for permitting` `return of said fiuidlfrom saidfchla'mber#to.y said reservoir through said piston, a Yv'erivcally recip "rcable handle member encircling said sleeve,'a '1 s lot ini-said sleeveranoperating member 'for s aid v releasemeans, said operating member being conother longitudinally extending 'poition; said release-means being operableby'movement of said.

`operating memberl in'vsaidlast mentioned longi-` tudinally extending l l LEONARD yD.' NIrsoN. 

